.banner {
  position: relative;
  overflow: hidden;
}

.banner-list {
  position: relative;
  height: 550px;
  transition: all 1000ms ease;
}

.banner-list .item {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  cursor: pointer;
}

.banner-list .item:first-child {
  opacity: 1;
}

.banner-list .item img {
  position: absolute;
  transform: translate(-50%);
  left: 50%;
  width: 1920px;
  height: 550px;
}

.indicator {
  display: flex;
  justify-content: center;
  position: absolute;
  left: 0;
  right: 0;
  bottom: 50px;
}

.indicator .item {
  width: 8px;
  height: 8px;
  margin: 0 8px;
  border-radius: 50%;
  background-color: #aaa;
}

.indicator .item.active {
  background-color: red;
}